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Colorectal cancer is one of the most frequent malignancies. Colonoscopy is the de facto standard for precancerous lesion detection in the colon, i.e., polyps, during screening studies or after facultative recommendation. In recent years, artificial intelligence, and especially deep learning techniques such as convolutional neural networks, have been applied to polyp detection and localization in order to develop real-time CADe systems. However, the performance of machine learning models is very sensitive to changes in the nature of the testing instances, especially when trying to reproduce results for totally different datasets to those used for model development, i.e., inter-dataset testing. Here, we report the results of testing of our previously published polyp detection model using ten public colonoscopy image datasets and analyze them in the context of the results of other 20 state-of-the-art publications using the same datasets. The F1-score of our recently published model was 0.88 when evaluated on a private test partition, i.e., intra-dataset testing, but it decayed, on average, by 13.65% when tested on ten public datasets. In the published research, the average intra-dataset F1-score is 0.91, and we observed that it also decays in the inter-dataset setting to an average F1-score of 0.83. Ministerio de Ciencia y Competitividad, Gobierno de España | Ref. DPI2017-87494-R Ministerio de Ciencia y Competitividad, Gobierno de España | Ref. PDC2021-121644-I00 Xunta de Galicia | Ref. ED481A-2019/299 Xunta de Galicia | Ref. ED431C2018/55-GRC Fundação para a Ciência e a Tecnologia | Ref. 2020.00515.CEECIND